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Unified Diff: src/ia32/macro-assembler-ia32.cc

Issue 7014033: Support conversion of clamped double values for pixel arrays in Crankshaft. (Closed) Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge
Patch Set: tweaks Created 9 years, 7 months ago
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Index: src/ia32/macro-assembler-ia32.cc
diff --git a/src/ia32/macro-assembler-ia32.cc b/src/ia32/macro-assembler-ia32.cc
index d5eda7a0d7640be2bc25d2f5375316c91acdd006..5c5d15567064a1c423194696574d500d4ce86f25 100644
--- a/src/ia32/macro-assembler-ia32.cc
+++ b/src/ia32/macro-assembler-ia32.cc
@@ -77,6 +77,46 @@ void MacroAssembler::RecordWriteHelper(Register object,
}
+void MacroAssembler::ClampDoubleToUint8(XMMRegister input_reg,
+ XMMRegister scratch_reg,
+ Register result_reg) {
+ Label above_zero;
+ Label done;
+ Label in_bounds;
+ ExternalReference zero = ExternalReference::address_of_zero();
+ movdbl(scratch_reg, Operand::StaticVariable(zero));
+ ucomisd(input_reg, scratch_reg);
+ j(above, &above_zero, Label::kNear);
+ Set(result_reg, Immediate(0));
+ jmp(&done, Label::kNear);
+ bind(&above_zero);
+ ExternalReference uint8_max_value =
+ ExternalReference::address_of_uint8_max_value();
+ movdbl(scratch_reg, Operand::StaticVariable(uint8_max_value));
+ ucomisd(input_reg, scratch_reg);
+ j(below_equal, &in_bounds, Label::kNear);
+ Set(result_reg, Immediate(255));
+ jmp(&done, Label::kNear);
+ bind(&in_bounds);
+ ExternalReference one_half =
+ ExternalReference::address_of_one_half();
+ movdbl(scratch_reg, Operand::StaticVariable(one_half));
+ addsd(scratch_reg, input_reg);
+ cvttsd2si(result_reg, Operand(scratch_reg));
+ bind(&done);
+}
+
+
+void MacroAssembler::ClampUint8(Register reg) {
+ Label done;
+ test(reg, Immediate(0xFFFFFF00));
+ j(zero, &done, Label::kNear);
+ setcc(negative, reg); // 1 if negative, 0 if positive.
+ dec_b(reg); // 0 if negative, 255 if positive.
+ bind(&done);
+}
+
+
void MacroAssembler::InNewSpace(Register object,
Register scratch,
Condition cc,

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